Former Illinois Rep. Robert Dold raised more than $610,000 in the second quarter for his comeback bid in Chicago's northern suburbs.

According to fundraising figures provided first to CQ Roll Call, the Republican will report $1.6 million in cash on hand as of the end of June for his challenge to Democratic Rep. Brad Schneider.

Dold came to Congress in the 2010 GOP wave — replacing Republican Mark Kirk, who was elected to the Senate — but was swiftly swept from office a cycle later by Schneider. The Democrat won by 1 point, while President Barack Obama carried the district by a 16-point margin.

Both House campaign committees have reserved TV airtime there in the fall — $800,000 worth of time from both — signaling the race will be one to watch in November. A recent poll conducted by the GOP-aligned outside group American Action Network found Dold leading Schneider 42 percent to 39 percent, with 19 percent undecided.

Fundraising reports covering April 1 to June 30 are due to the Federal Election Commission by July 15. Schneider has yet to announce his second-quarter numbers. As of March 31, he had $1.3 million in cash on hand.

Illinois' 10th District is rated a Tilts Democratic contest by Rothenberg Political Report/Roll Call.